Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3648ab1852f44f…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 05:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2f75b7c3d983d64656db5c0eba79da8 SHA-1: a77a4def9e9f28d5d006bd9a6e07f9a2ff6b7434 SHA-256: 9e3648ab1852f44fc58141d419ca06795b5ec0bf7d5547977c6fef5d6692aaf4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing page or download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/3342795652.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/kukepilidato.pdf
    • http://videofilm-tv.ru/content/File/tagaturokewoxidewomevip.pdf
    • http://banghetretruc.com/media/ftp/file/xitutude.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/73934268348.pdf
    • https://total-sport.pl/img/upload/files/21204998662.pdf
    • http://hongdanhaudio.com/luutru/files/kisix.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b737e547457---16564259964.pdf
    • http://www.derbysignandgraphics.com/uploads/file/tazoda.pdf
    • http://kielcenoca.pl/files/file/bodokes.pdf
    • http://euredit-editions.com/userfiles/file/sizajexibofijowutaresoz.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jqv8lfkrvnibpkonpjgfimrmd0/nukurewedagise.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t2nfceufkbollv8hlasqt2ed33/85835673724.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f7550e8b---vajiteg.pdf
    • http://itfind.ru/uploads/file/15925956029.pdf
    • https://24emk.ru/ckfinder/userfiles/files/58092872169.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/csuevgehunc5679hlch5cutk07/50681030011.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf1589698---vumeziwakerivodobur.pdf
    • https://artbynela.com/uploads/file/2254486284.pdf
    • http://abnicum.com/files/file/jexepeviw.pdf
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/77750560379.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/fufowelasupoke.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda08ec4aca---68575078798.pdf
    • http://zulaikhatextile.com/userfiles/files/vonurivefifowetajasuxuzos.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04bfb1e03---mogunogibizuwe.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086f88192bc1---guxikumovometuvo.pdf
    • https://digireg.se/upload/78811832936.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=frequency+distribution+table+class+8
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e420.bin
bc942d0009164a540bed6a035ee1c17fb5f0641a5e9501935d5ab647e496d688
pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 11048 bytes
font_01_sfnt_off0000fdbc.bin
81899c779ecccbb26c8d008b4a284eb4fb0a4c088ec3f61290c1d4f02e468c41
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 17552 bytes
font_02_sfnt_off00012bf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 16792 bytes